What is Firebase messaging token?

Firebase Cloud Messaging (FCM) is a messaging solution that lets you reliably send messages at no cost to both Android & iOS devices . Using FCM, you can send data payloads (via a message) to a device for a specific application. Each message can transfer a payload of up to 4KB to a client.

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What is Firebase in-app messaging?

Firebase In-App Messaging helps you engage your app’s active users by sending them targeted, contextual messages that encourage them to use key app features . For example, you could send an in-app message to get users to subscribe, watch a video, complete a level, or buy an item.

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